libinput/doc/reporting-bugs.dox

/**
@page reporting_bugs Reporting bugs

A new bug can be filed here:
https://bugs.freedesktop.org/enter_bug.cgi?product=Wayland&component=libinput

When reporting bugs against libinput, please follow the instructions below
and provide the required data. This will speed up triage, resulting in a
quicker bugfix.

First, try to identify the bug by reproducing it reliably. The more
specific a bug description is, the easier it is to fix. The @ref
libinput-debug-events helper tool can help identify whether the bug is in
libinput at all. This tool is a direct hook to libinput without a desktop
stack in between and can thus help to identify whether a bug is in libinput
or in one of the higher layers. See the @ref libinput-debug-events section
for information on this tool.

@section triage Required information for triage

When you file a bug, please attach the following information:
- a virtual description of your input device, see @ref evemu. This is the
  most important piece of information, do not forget it!
- the libinput version. Either the package version from your distribution
  or, when running from git: <tt>git log -n 1 HEAD</tt> or <tt>git describe
  HEAD</tt>. As a last resort: <tt>libinput-list-devices --version</tt>.
- the current libinput settings for the device. This is a bit harder to
  obtain, for now we'll assume you are running X11. The current settings can
  be obtained with <tt>xinput list-props "your device name"</tt>. Use
  <tt>xinput list</tt> to obtain the device name.
- if the device is a touchpad or a pointing stick, the vendor model number
  of your laptop, and the content of <tt>/sys/class/dmi/id/modalias</tt>.
- if the device is a touchpad, the physical dimensions of your touchpad in
  mm

@section evemu Recording devices with evemu

<a href="http://www.freedesktop.org/wiki/Evemu/">evemu</a> records the
device capabilities together with the event stream from the kernel. On our
side, this allows us to recreate a virtual device identical to your device
and re-play the event sequence, hopefully triggering the same bug.

evemu-record takes a <tt>/dev/input/eventX</tt> event node, but without arguments
it will simply show the list of devices and let you select:
@code
$ sudo evemu-record > scroll.evemu
Available devices:
/dev/input/event0:	Lid Switch
/dev/input/event1:	Sleep Button
/dev/input/event2:	Power Button
/dev/input/event3:	AT Translated Set 2 keyboard
/dev/input/event4:	SynPS/2 Synaptics TouchPad
/dev/input/event5:	Video Bus
/dev/input/event6:	ELAN Touchscreen
/dev/input/event10:	ThinkPad Extra Buttons
/dev/input/event11:	HDA Intel HDMI HDMI/DP,pcm=3
/dev/input/event12:	HDA Intel HDMI HDMI/DP,pcm=7
/dev/input/event13:	HDA Intel HDMI HDMI/DP,pcm=8
/dev/input/event14:	HDA Intel PCH Dock Mic
/dev/input/event15:	HDA Intel PCH Mic
/dev/input/event16:	HDA Intel PCH Dock Headphone
/dev/input/event17:	HDA Intel PCH Headphone
/dev/input/event18:	Integrated Camera
/dev/input/event19:	TPPS/2 IBM TrackPoint
Select the device event number [0-19]:
@endcode

Select the device that triggers the issue, then reproduce the bug and Ctrl+C
the process. The resulting recording, ("scroll.evemu" in this example) will
contain the sequence required to reproduce the bug. If the bug fails to
reproduce during recording, simply Ctrl+C and restart evemu-record.
Always start the recording from a neutral state, i.e. without any buttons or
keys down, with the position of the device in the neutral position, without
touching the screen/touchpad.

@note The longer the recording, the harder it is to identify the event
sequence triggering the bug. Please keep the event sequence as short as possible.

To verify that the recording contains the bug, you can replay it on your
device. For example, to replay the sequence recorded in the example above:
@code
$ sudo evemu-play /dev/input/event4 < scroll.evemu
@endcode

If the bug is triggered by replaying on your device, attach the recording to
the bug report.

*/